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sagt3k

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Joined: 01/02/2015
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Posted: 06:51am 29 Nov 2018

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Hi Geoff

Is it possible to have a variable like MM.WATCHDOG but increased +1 after the instruction CPU RESTART?

Thanks
Antonio

Turbo46

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Joined: 24/12/2017
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Posts: 1646

Posted: 07:27am 29 Nov 2018

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Antonio,

Would something like this suit your purpose?

'
DIM CPU_Starts% = 0
VAR RESTORE
CPU_Starts% = CPU_Starts + 1
IF CPU_Starts% <= 10 THEN
VAR SAVE
END IF
'

If this is put near the start of your program CPU_Starts% will record the number of times the program has restarted. I've chosen a limit of 10 to save the flash from over-use.

It might be a problem if you are using VAR SAVE and VAR RESTORE elsewhere in your program.

Bill

Keep safe. Live long and prosper.

sagt3k

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Posted: 08:07am 29 Nov 2018

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Hi Bill
Thanks, I already use this method, I just wanted to know if it was useful and implementable MM.RESTART in RAM. Is CPU RESTART a HW reset or SW reset?

AntonioEdited by sagt3k 2018-11-30

Turbo46

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Posted: 09:01am 29 Nov 2018

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OK Antonio,

But your query did make me realise that it would be good to have a way of knowing if a watchdog (internal or external) was operated and how many times it has. In a slave device, this could be reported to the master.

Bill

Keep safe. Live long and prosper.

sagt3k

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Posted: 09:23am 29 Nov 2018

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Hi Bill

Exact

, it would be convenient to have a variable RAM (integer) that is not affected by a sw reset.

Take for example simple IOT remote device. You put it in inaccessible places, maybe you've never had power problems, but for reasons of logic code you had watchdog and cpu restart, then after you connect a uart and you would like to know how many times the micro has restarted.

Ok, you could use the RAM/EPROM of other devices/i2c, but it would increase the costs and complexity of the circuit.

AntonioEdited by sagt3k 2018-11-30

matherp
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Posted: 09:36am 29 Nov 2018

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Quote Exact , it would be convenient to have a variable RAM (integer) that is not affected by a sw reset.

This should certainly be possible and sounds like a useful idea. I'll have a play on the MMX as part of the 5.05.01 update and report back.

Geoffg

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Posted: 11:06am 29 Nov 2018

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It is possible (and easy to do). The syntax would be challenging.

Perhaps something like:
MM.KEEPVALUE = nn
CPU RESET
...
PRINT MM.KEEPVALUE

Geoff

Geoff Graham - http://geoffg.net

matherp
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Posted: 11:15am 29 Nov 2018

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Just implemented in the latest MMX firmware

Quote It includes a new function and command MM.PERSIST. MM.PERSIST is an integer variable that is not affected by CPU RESTART or a watchdog restart. So you can assign a value to it.

MM.PERSIST=123

then restart

CPU RESTART

then use the variable

? MM.PERSIST

long long int saved_variable __attribute__ ((persistent));
void fun_persist(void){
iret = saved_variable;
targ = T_INT;
}
void cmd_persist(void) {
while(*cmdline && tokenfunction(*cmdline) != op_equal) cmdline++;
if(!*cmdline) error("Syntax");
saved_variable = getinteger(++cmdline);
}

Edited by matherp 2018-11-30

sagt3k

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Posted: 11:56am 29 Nov 2018

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Hi Geoff & matherph

Thanks

, but will it be available on all MMbasic family PIC32,MMX,STM32 ?

Thanks
Antonio

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